OF THE VEGETABLE CELL. 147 



the author. He then adverts to the " swarm-spores," which 

 are said to possess only a primordial utricle, and is of opinion 

 that the earlier limitation of these bodies is simply formed by 

 the young cell-wall itself, which is unable to resist the pow- 

 erful influence of re-ag-ents, whilst at a later period, as the 

 zoospore is more fully formed, it presents a stronger and firmer 

 consistence. In a note, he remarks that the cilia of the zoo- 

 spores are not motile organs, but for the purpose of attach- 

 ment, and that the motion is induced in consequence of 

 the perforation of the outer membrane, at which points a 

 more active endosmosis takes place, as may be seen in the 

 zoospores of (Edorjonium, in which, when germinating, the 

 opening through the outer membrane of the spore is always 

 visible, from which the first commencement of the root pro- 

 ceeds. 



The eighth section gives a resume of the foregoing obser- 

 vations, and in the ninth the author adds a few supplementaiy 

 remarks upon the methods to be pursued in researches of 

 this kind, and particularly upon the application of chemical 

 re-agents under the microscope, and with respect to the 

 period at which the division of the cells in the CoJifervcB may 

 be best observed. 



A Manual of Marine Zoology for the British Isles. By Philip 

 Henry Gosse. London : Van Voorst. 



A Handbook to the Marine Aquarium. By Philip Henry Gossr. 

 London : Van Voorst. 



Although the microscope is more capable of affording 

 amusement than most philosophical instruments, there are few 

 who have used it for any length of time but have discovered 

 that it is an important aid in scientific research. Even those 

 who have purchased their first instrument to wile away a 

 leisure hour have gradually got interested in its structure, and 

 the nature of the objects investigated, so that, although be- 

 ginning in play, they have ended in work. No one can know 

 that they have observed, for the first time, a fact new in the 

 history of science, witiiout the rising of the feeling that con- 

 stitutes the discoverer in science — the seeker after truth. It 

 is thus that many great microscopic observers have arisen 

 among classes who have had no previous scientific edu- 

 cation that has prepared the world for the result of their 

 labours. The structure of the instrument, involving as it 

 does the greatest mechanical accuracy with the most interest- 

 ing problems of optical science, has excited the attention of 

 one set of inquirers, whose labours have resulted in the 



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